Kerikeri's Tuke also got one over his Olympic and America's Cup teammate Peter Burling, who with fellow Team New Zealand member Carlos Huisman crossed the line in fifth in stage four. That was good enough for third overall.
Mapfre skipper Xabi Fernandez said halting the leg short was a good decision irregardless of the wind.
"I think it was a good decision [to shorten the stage] because this Leg Zero was already becoming quite long," he said.
"It's been very interesting. We've done a lot of training over the winter and I think we've seen that we sail very well.
"I think the racing is going to be tight and you have to push all the time. Even tonight and yesterday afternoon, sometimes we were dead, then we pass the competition again.
"We have to push and sail well every watch. We knew all this but again this has been a reminder then you cannot 'put your hands down'."
Tuke is gunning to become the first New Zealander to complete a triple crown of sailing: Olympic gold, the America's Cup and the Volvo Ocean Race.